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Received: 28 March 2019 Accepted: 30 August 2019 During a pool boiling process, the bubble distribution plays an essential role in the heat transfer enhancement. In the present work, a controllable test rig was prepared to investigate the heat flux and superheat temperature in a nucleate pool boiling process. Aqueous solutions of three surfactants were tested on three heated tubes that are made of brass, aluminum, and stainless steel with almost the same surface roughness. The investigated surfactants are; TRITON X100, SLES, and SDS, each one was tested at concentrations; 0, 100, 400, 700, 1000, 1300, 1600 and 1900 ppm. For each case, the measured superheat temperatures and their corresponding heat fluxes and physical properties of the surfactant solution are fed into suitable relations. Consequently, correlations could be deduced to relate the heat flux to the bubble distribution, the superheat temperature and the concentration of different surfactant solutions. The results showed that, for all cases, the density of bubble distribution increased with the superheat temperature, the heat flux, and the surfactant concentration. For TRITON-X, the bubble distribution increased considerably with the surfactant concentration until the range of values between 400 and 700 ppm, and beyond this range, this rate of increase started to decay.

Relating the Bubble Density to the Heat Transfer in Pool Boiling Processes of Surfactant Solutions